Process for the production of leather-board stock.



UNITED sT TEs PATENT-OFFICE.

ALBERT n cLArr, or BaAmrnEnn ssAcnUsErrs,

COMPANY, or nos'ron, mAssAcHUsErrs, A

1,021,660. No Drawing.

To all whom it may concern:

Be it knownthat I ALBERT L. CLAPP, a citizen of the United States,residing at Braintree, in the county of Norfolk and State ofMassachusetts, have invented certain new and useful Improvements inProcesses for the Production of Leather-Board Stock, of which thefollowing'is a specification.

My present invention pertains to an improved process for the productionof stock .to be employed in the manufacture of leather-board, and hasfor its main object the production of a filler which, when mixed withamass of fibrous leather, will produce a substantially waterproofleathcr-board which, in addition to being substantiallyparts of sodaash, together with water to beaten up) and mixed therewith. ingmixedwith the cellulose, a suitable prewaterproof, will be firm and pliableand possess a body texturallycapable of taking and holding a goodfinish.

The essence of the present invention resides in the employment ofcellulose as a filler, and in treating the cellulose pulp in such amanner as to completely waterproof the finished leather-board of whichthe treated cellulose forms a constituent.

Any kind or grade of cellulose fiber may be used in carrying out theprocess, such as sulfate fiber pulp, soda pulp, rag stock or paperstock,- beaten out to a fibrousv pulp.

Preferably, the process will be carried out as follows: Cellulose, say500 pounds, is beaten out with a sufiicient quantity of water toproducea pulpy mass. This mass is then treated withan emulsion, preferablyformed of elements some of which are inherently waterproof in theirnature, as for. instance:

parts of mineral oil, 75 parts of rosin, 50 parts of red oil or stearin,25

render the emulsion su fliciently fluid. This compound, which forms afatty emulsion, is preferably heated and prepared in a' receptacleindependent of theq pulpy mass,,. and

after being'prepared is added to the cellulose stock, (which has beenpreviously After hecipitant, such as aluminum sulfate,

say to the amount of 150 pounds, is to be added,

which causes a precipitate to be thrown down from the emulsion, theprecipitate covering the fibers of the cellulose, and beinginsolublerenders said fibers substantially waterproof. When theprecipitation iscompleted, the

'sufiiciently water ing upon lulose thus treated of the cellulose,

ASSIGNOR 'ro HIDE-I'm LEATHER CORPORATION or MAINE.

ra'ocnss m 'rnn PRODUCTION OFLEATHER-IBOARD s'rocx.

Specification 01 Letters Patent. P t t d 2 ,1912; -A pplication filedJanuary 4, 1911.

Serial No. 600,728.

pulpy mass is then dumped into a beater-load of, say, 1000 ,pounds. ofleather fiber; The leather and the cellulose fibers are then thoroughlymixed and afterward formed into board in the usual way. a From theforegoing it will 'be noted that the precipitation takes place u on thecellu-' lose fibers, and inasmuch as t e precipitating agentexpendsitself the leather fibers are una ected and retain their naturalproperties. It may also be lipon the emulsion v stated that thecellulose fibers are practically the chemicals used and retain theirelasticity and fibrous properties. The red oil above referred to is theequivalent of claim oil, or as it is sometimes commercially known,saponified red oil. V v

The finished board may be said to contain waterproof cellulose fibers,mixed with natural leather-fibers, the cellulose fibers being boardsubstantial y waterproof.

Having thus. described my invention,

what I claim'is: i 4

1. The process of producing stock for leather-board, which consists inwaterproofing cellulose fibers, and mixing such fibers with fibrousleathen. a I

2. The' process ofproducing stock for leather-board, which consists 'inprecipitatthe fibers of a mass of cellulose a waterproofing material,and mixing the celwith a massof leather fibers.

3. The process of producing stock for leather-board, which-consists inbeating up cellulose,

precipitating an insoluble compound upon the fibers of the cellulosestock,

roof to render the "entireand add ng the cellulose fibers thus treatedto a massof leather fibers.

4. The process of producing stock for leather-board, which 0 nsis'ts inbeating up a charged cellulose, adding thereto a fatty emulsiomprecipitating said emulsion, and

adding the fibers thus treated to'a mass ofleathenfibers. 5. The processof producing leather-board stock, which consists in beating out a chargeof cellulose to produce a fibrous mass, adding to said mass an emulsioncontaining an inherently waterproofing material, precipitating saidemulsion directlyupon the fibers and adding the waterproofed cellulosefibers to a charge of leather fibers.

6. The process of producing stock for leather-board, which consists inbeating out a charge of cellulose to produce a fibrous mass, addingthereto an emulsion composed of mineral oil, rosin, red oil and sodaash; precipitatin said emulsion upon the fibers by the addlticn ofaluminum sulfate, and adding the fibers thus treated to. a mass offibrous leather.

' 7. As a -new article of manufacture, leather-board comprising a bodyof fibrous leather having incorporated therewith Waterproofed cellulosefibers.

8. 'As a new article. of manufacture,

leather-board comprising a body of fibrous 15 leather havingincorporated therewith cellulose fibers having deposited thereon awaterproof precipitate.

In testimony whereof I have signed my name to this specification in thepresence of 20 two subscribing witnesses.

ALBERT L. CLAPP.

Witnesses;

JULIA M. ENEGESS, ALEX D. SALINdER

